Electrolytic Cell Feedwater Cooling for Hydrogen Peroxide Efficiency
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Solution Overview
Problem
Existing electrolytic cells for producing hydrogen peroxide face efficiency losses due to elevated temperatures, which increase ionic conductivity but also promote the reduction of peroxide to water, deactivating catalysts and reducing Faradaic efficiency.
Innovation Solution
A system that includes a heat exchanger to cool deionized water before it enters the electrolytic cells, maintaining the temperature below a threshold to optimize Faradaic efficiency, using a controller to regulate the heat exchanger and flow rates to manage cell temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the temperature of the electrolytic cell is increased to improve ionic conductivity of the PEM, then the electrical efficiency of the cell is improved, but the Faradaic efficiency decreases due to peroxide reduction to water and catalyst deactivation
Solution Approach 1:
The patent applies preliminary action by pre-cooling the feed water before it enters the electrolytic cell. The cooling system removes heat from the feed water in advance, ensuring that the water enters the cell at a temperature below a specified threshold (e.g., 25°C). This preliminary cooling prevents temperature rise during operation that would otherwise lead to peroxide reduction and catalyst deactivation, thereby maintaining high Faradaic efficiency while allowing the cell to operate at optimized electrical efficiency.
2Reliability
If the temperature of the electrolytic cell is increased to enhance ionic conductivity, then the performance of the PEM is improved, but the lifespan of the catalyst is reduced due to thermal degradation
Solution Approach 1:
The patent implements feedback control by continuously monitoring the temperature of the electrolytic cell and adjusting the cooling system accordingly. Temperature sensors provide real-time data to a control system that modulates the cooling rate to maintain the cell temperature within an optimal range. This feedback mechanism ensures that the PEM operates at temperatures that maximize ionic conductivity while preventing excessive heat accumulation that would degrade the catalyst, thereby extending catalyst lifespan.
3Reliability
If the cooling rate is increased to maintain low cell temperature and optimize Faradaic efficiency, then the peroxide stability is improved, but the energy consumption of the cooling system increases
Solution Approach 1:
The patent applies parameter changes by optimizing the cooling rate to achieve the minimum necessary cooling to maintain peroxide stability. Rather than continuously applying maximum cooling, the system adjusts the cooling parameter (cooling rate) based on the actual temperature and operational conditions. This allows the system to maintain peroxide stability by keeping temperature below the threshold for reduction while minimizing the energy input required for cooling, thus reducing overall energy consumption.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system significantly improves Faradaic efficiency and extends the lifespan of catalysts by keeping cell temperatures low, enhancing overall performance and reducing operational costs.
Implementation Method 1
a heat exchanger configured to remove heat from deionized water
Implementation Method 2
oxidizing the deionized water in the anode passage of the one or more cells
Implementation Method 3
An electrolytic cell that generates hydrogen peroxide from oxygen and water
Implementation Method 4
a proton exchange membrane (PEM) such as Nafion to provide a local ion source for the reduction reaction
Implementation Method 5
deliver oxygen, electrons, and protons to a high surface electrode to affect the two-electron reduction of oxygen to hydrogen peroxide
Implementation Method 6
a heat exchanger configured to remove heat from deionized water
Data Source
AI summary
Embodiments for an apparatus for producing hydrogen peroxide are provided. The apparatus includes a heat exchanger configured to remove heat from deionized water prior to passing the deionized water through the anode passage of one or more cells. The apparatus is also configured to oxidize the deionized water in the anode passage of the one or more cells. The apparatus also includes a controller configured to control the heat exchanger and a first one or more temperature sensors electrically coupled to the controller. The first one or more temperature sensors are configured to provide a first temperature reading based on a temperature of the one or more cells, wherein the controller is configured to control the heat exchanger to maintain the first temperature reading at or below a first temperature threshold.